Inhibition of human arginase I by substrate and product analogues.

Inhibition of human arginase I by substrate and product analogues.
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DOI:
10.1016/j.abb.2010.02.004
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发表时间:
2010-04-15
影响因子:
3.9
通讯作者:
Christianson, David W.
Christianson, David W.
中科院分区:
生物学3区
文献类型:
--
作者:
Di Costanzo, Luigi;Ilies, Monica;Thorn, Katherine J.;Christianson, David W.

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人精氨酸酶I是一种双核锰金属酶,催化L-精氨酸水解生成L-鸟氨酸和尿素。我们证明,N-羟基-L-精氨酸(NOHA)与该酶结合的Kd = 3.6 μM,去甲-N-羟基-L-精氨酸(nor-NOHA)与Kd = 517 nM(表面等离子体共振)或Kd = 50 nM(等温滴定量热法)结合。与NOHA和nor-NOHA复合的人胰蛋白酶I的晶体分别提供2.04 μ m和1.55 μ m的分辨率结构,与先前确定的与大鼠胰蛋白酶I的相应复合物的结构相比,这是显著改善的。更高分辨率的结构阐明了抑制剂的结合相互作用。最后,在1.90 nm分辨率下报道了与L-赖氨酸(Kd = 13 μM)的复合物的晶体结构。该结构证实了与抑制剂α-羧酸和α-氨基的氢键相互作用作为在酶活性位点中氨基酸识别的关键特异性决定因素的重要性。
Human arginase I is a binuclear manganese metalloenzyme that catalyzes the hydrolysis of L-arginine to generate L-ornithine and urea. We demonstrate that N-hydroxy-L-arginine (NOHA) binds to this enzyme with Kd = 3.6 μM, and nor-N-hydroxy-L-arginine (nor-NOHA) binds with Kd = 517 nM (surface plasmon resonance) or Kd ≈ 50 nM (isothermal titration calorimetry). Crystals of human arginase I complexed with NOHA and nor-NOHA afford 2.04 Å and 1.55 Å resolution structures, respectively, which are significantly improved in comparison with previously determined structures of the corresponding complexes with rat arginase I. Higher resolution structures clarify the binding interactions of the inhibitors. Finally, the crystal structure of the complex with L-lysine (Kd = 13 μM) is reported at 1.90 Å resolution. This structure confirms the importance of hydrogen bond interactions with inhibitor α-carboxylate and α-amino groups as key specificity determinants of amino acid recognition in the arginase active site.
DOI: 10.3109/13813459409003940
发表时间: 1994-09-01
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